[Table of Contents]

Plasma and Fusion Research

Volume 9, 1202126 (2014)

Rapid Communications

First Results of Electron Temperature Measurements with a Multi-Pass Thomson Scattering System in the Tandem Mirror GAMMA 10
Masayuki YOSHIKAWA, Ryo YASUHARA1), Kazuhide NAGASU, Yuuki SHIMAMURA, Yoriko SHIMA, Junko KOHAGURA, Mizuki SAKAMOTO, Yousuke NAKASHIMA, Tsuyoshi IMAI, Makoto ICHIMURA, Ichihiro YAMADA1), Hisamichi FUNABA1), Kazuo KAWAHATA1) and Takashi MINAMI2)
Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
2)
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
(Received 14 May 2014 / Accepted 11 June 2014 / Published 29 July 2014)

Abstract

A multi-pass Thomson scattering (TS) system has the advantage of enhancing scattered signals. We constructed a multi-pass TS system modeled on the GAMMA 10 TS system; the new system has a polarization-based configuration with an image relaying system. For the first time, we used the new system to measure electron temperatures in the GAMMA 10 plasma. By using the multi-pass TS system with four passes, the integrated scattering signal was magnified by approximately a factor of three.

Keywords

Thomson scattering, multi-pass, polarization-controlled, tandem mirror GAMMA 10

DOI: 10.1585/pfr.9.1202126

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This paper may be cited as follows:

Masayuki YOSHIKAWA, Ryo YASUHARA, Kazuhide NAGASU, Yuuki SHIMAMURA, Yoriko SHIMA, Junko KOHAGURA, Mizuki SAKAMOTO, Yousuke NAKASHIMA, Tsuyoshi IMAI, Makoto ICHIMURA, Ichihiro YAMADA, Hisamichi FUNABA, Kazuo KAWAHATA and Takashi MINAMI, Plasma Fusion Res. 9, 1202126 (2014).